Condenser with metalized dielectric



\ June 3, 1941. a TRAUB CONDENSER WITH IETALIZED DIELECTRIC Filed July 6, 1937 .7): ve nlar:

Patented June a, 1941 2,244,090 compasses wr'rir us'ramznp prnmcrm Eberhard 'lraub, Stuttgart, Germany, aasignor to Bosch Gueilschai' hrinkter Robert tmitbeac .IIaftung, Stuttgart, Germany Application July 6,1937. Serial No. 152,157 In Germany August 4, i936 14 Claims; (01. 115-41) This invention relates to condensers with metaliaed dielectric in which therefore no independent metal foil is used but for the making .of which a dielectric serves upon which the condenser covering is produced by spraying, rolling.

'in particular, however, by atomization (cathode atomization) or by the vaporization of metal or is otherwise directly produced. In such condensers contact difllculties easily result at the current connections, in particular when the condenser covering is very thin, for example if it is less than 0.002 mm. or 0.001 mm.

In such condensers in order to secure a lasting current connectionit has been proposed according to application Serial No. 22,072 that an edge of the dielectric provided with the metallic coveringis turned down 180 so that the metal covering will come on the outside. The contact for the current is attached to the turned down edges left free after the assembling. If such a condenser is constructed only of metalized dielectric then we shall have on the turned down edges a direct contact with the metalized surface of the adjacent layers of the same potential. However if we use besides the metalized also intermediate layers of non-metalized dielectric then measures must be taken if we wish to obtain a mutual contact of the adjacent layers of the same potential.

We may obtain a simple condenser structure according to the invention if we turn down not only the edge of the metalized dielectric layers but also the edge of the non-metalized dielectric layers, and that in such manner that the foldededges of the non-metalized dielectric layers will dielectric layers in considerably increased thickness. A-A indicates in the drawing the center line of the condenser. For the construction of the coil, in the embodiment shown, metalized paper is employed, especially paper which has received vaporized metal (zinc or cadmium for example) or has been metalized by cathode atomization. By a is designated the one and by b the other metalized paper strip. is the metal coating upon the strip a and d the metal coating upon the strip b. The metal coatings or coverings have a thickness of about 0.0001 mm. f and o are two non-metalized paper strips. The non-metalized paper strips are, Just like the metalized pa-.- per strips, turned down at one edge of the condenser by 180 and that in such a way that the turned down edges of the strips and a will lie within the turned down folds of the strips 0 and b.

On the front sides of the condenser on the turned down edges of the metal coverings c and d lying exposed to the outside is attached the connection for the current. It consists of a metal coating h which is specially produced by spraying thereupon. The metal covering it should not be too thick as otherwise it will be too brittle. It must be merely so thiclrisay 0.3 to 0.5 mm.) that a terminal wire can be soldered thereon. In the drawing 1' and 10 indicate the two connecting wires.

The individual coatings do not have in a radial direction, 'asis shown in the drawing for sake of clearness, an interval between one another but are rolled directly on one another.

In the example of the invention between the two metalized paper strips 0 and b only one non-metalized paper strip j and a is used respectively. If we use between the metalized dielectric coatings a plurality of non-metalized dielectric coatings then we turn down the edges of all non-metalized coatings and that in such fashion that the folded edges of the metalized coatings will overlap them.

' What is claimed is:

1. A condenser comprising successive layers of metalized and non-metalized insulating material arranged so that the metalized and non-metalized layers alternate with each other, alternate metalized layers being brought into contact with each other at one edge by folding over one edge of said alternate metalized layers and the cooperating non-metalized layers so that the folded edge of a non-metalized layer lies within the fold and the metal coating of the metalized layer faces the outside of the fold;

2. A condenser comprising successive layers of metalized material separated by layers of nonmetalized material, one edge of a metalized layer and the adjacent edge of a non-metalized layer being folded upon themselves and the opposite edge of the next metalized layer and the adjacent edge of a non-metalized layer being folded upon themselves so that each folded edge of the nonmetalized layer lies within a fold and the metal coating of each metalized layer faces the outside of a fold, the metal coated corners of such folds providing metal coated edges lying exposed at the sides of said condenser, and a metal coating connecting said coated edges.

3. A condenser comprising strips of metalized and non-metalised insulating material wound up in the form of a roll to provide successive layers of metalized insulating material separated by layers of non-metalized insulating material, one

edge of each metalized strip and the adjacent edge of each non-metalized strip being folded uponthemselves so that the folded edge' of each non-metalized strip lies within a fold and the metal coating of each metalized strip faces the outside of a fold and contacts the adjacent coating of the same polarity, the folded edges of one set of cooperating metalized and non-metalized strips lying adjacent to but spaced from the unfolded edges .of the next set of cooperating metalized and non-metalized strips, the metal coated corners of such folds providing continuous metalcoated edges lying exposed at the sides of said condenser, and condenser terminals connected to said fold corners.

4. A condenser comprising at least two strips of insulating material wound up in the form of a roll, one side of one of said strips being provided with a coating of metal, an edge of a coated strip and an edge of an uncoated strip being folded upon themselves so that the folded edge of the uncoated strip lies within the fold and the metal coating of the coated strip faces the outside of the fold to thereby provide a continuous metal-coated edge exposed at the side of the condenser to form a surface for connection of a terminal of the condenser.

5. A condenser comprising two strips of metalizedpaper and at least two strips of non-metalized paper wound up in the form of a roll with the metalized strips alternating with the nonmetalized strips, one edge of one metalized strip and the adjacent edge of a non-metalized strip being folded upon themselves and the opposed edges of the other metalized and non-metalized strips being folded upon themselves so that each folded edge of the non-metalized strip lies within a fold and the metal coating of each metalized strip faces the outside of a fold and contacts the adjacent coating of the same polarity, the metal coated corners of such fold providing continuous metal-coated edges lying exposed at the sides of said condenser, and condenser terminals connected to said fold corners.

6. A condenser as set out in claim 5, in which the thickness of the metalization is about 0.0001 mm.

'7. A condenser comprising successive layers of 'metalized and non-metalized paper, one edge of adjoining metalized and non-metalized layers being folded upon themselves at an angle of 180 so that the metal coating of the metalized layer faces the outside of the fold with the folded edge of the non-metalized layer within the fold, the metal-coated corners of such folds lying exposed at the sides of the condenser, and a metal coating applied to and connecting said fold corners.

8. A condenser comprising a plurality of superposed layers of metalized dielectric and intermediate layers of non-metalized dielectric, alter nate metalized layers of said metalized dielectric being brought into metallic contact with each other by folding over the edges of said layers and the cooperating non-metalized layers so that the metalization faces the outside of the folds and provides a plurality of metal-coated folded edges at opposite sides of the condenser, the folded edges of the non-metalized layers each lying within a fold. I

9. A condenser as set out in claim 8, including a metal coating connecting said metal-coated folded edges and providing condenser terminals.

10. A condenser as set out in claim 8, in which the thickness of the metalization' is less than 0.001 mm.

11. A condenser comprising two strips of metalized paper and at least two strips of non-metalthe metalized strips alternating with the nonmetallzed strips, one edge of one metalized strip and the adjacent edge of a non-metalized strip and the opposed edges of the other metalized and non-metalized strips being folded longitudinally upon themselves at an angle of so that each folded edge of the non-metalized strips lies within a fold of the metalized strips and the metal coating of each'metalized strip faces the outside of a fold and is in metalic contact with the next succeeding coating of the same polarity, the metal-coated corners of said folds providing continuous metal-coated edges lying exposed at and forming the sides of said condenser, a terminal metal layer applied to each side of said condenser and electrically connecting said metalcoated corners, and a terminal conductor soldered to each terminal metal layer.

12. A condenser as set out in claim 11, in which the metalization has a thickness of about 0.0001 mm.

13. A condenser comprising two strips of metalized paper and at least two strips of non-metalized paperwound up in the form of a roll with the metalized strips alternating with the nonmetalized strips, the metalization of each metalized strip extending to one edge thereof, a nonmetalized margin remaining along the opposite edge of each strip, the metalized edge of one metalized strip and the adjacent edge of a nonmetalized strip being folded upon themselves and the metalized edge of the other metalized strip and the adjacent edge of the other non-metalized strip being folded upon themselves so that each folded edge of the non-metalized strips lies within a fold and the metalization of each metalized strip faces the outside of a fold and contacts the adjacent metalization of the same polarity, the metal coated corners of such folds providin continuous metal coated edges lying exposed at and forming the sides of said condenser, and a metal coating applied to and connecting said fold corners at each side of said condenser.

14. A condenser comprising two strips of metalized paper and at least two strips of non-metalized paper wound up in the form of a roll with the metalized strips alternatingwith the nonmetalized strips, the metalizatlon of each metalized strip having a thickness of less than'0.001 mm. extending to one edge thereof, a non-metalized margin remaining along the opposite edge of each strip, the metalized edge of one metalized.

strip and the adjacent edge of a non-metalized strip being folded upon themselves and the metalranged alternately at opposite sides of the condenser to provide continuous metal coated edges lying exposed at and forming the sides of said condenser, and a metal coating applied to and connecting said exposed folded metal coated edges at each side of said condenser.

EBERHARD TRAUB. 

